Environmental Engineering
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the

Dissolved oxygen in water
Turbidity in water
Hardness in water
Residual chlorine in water

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Environmental Engineering
The major disadvantage of lime soda process of water softening is that

Huge amount of precipitate is formed which creates a disposal problem
It is unsuitable for turbid and acidic water
It is unsuitable for softening the water of excessive hardness
The effluent cannot be reduced to zero hardness

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Environmental Engineering
Double filtration is used

To increase the filtration slow sand filters capacity of
To increase the filtration rapid sand filters capacity of
All of these
For isolated buildings like pools, hotels etc swimming

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